about libpq-C FETCH ALL performance issue

Hello,

I'm working on a project where libpq-C is envolved. We
have several background processes keep querying
certain data from database and send them out as ip
packets. With libpq-C interface, I have to use 

res = PQexec(conn, "DECLARE myportal CURSOR FOR select
* from pg_database");

and then  res = PQexec(conn, "FETCH ALL in myportal");


to get the data. 

I found when our database has more and more data, res
= PQexec(conn, "FETCH ALL in myportal"); cost more and
more time, much more than 

res = PQexec(conn, "DECLARE myportal CURSOR FOR select
* from pg_database"); 

and make our sending packet rate extremely low. We get
into big problems here. 

I wonder if there is other faster way ( I mean other
than FETCH ALL command) to get data from database with
libpq-C, or If you have a patch to fix this problem.

Hope to hear from you soon.


Best Regards

jing

    
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